And today I learned you can't really do that.

Serena Williams has undoubtedly received several million-dollar checks over the course of her impressive tennis career. But back when she got her very first one, it apparently didn't phase her and she treated it like any ordinary paycheck, by simply rolling through the ATM drive-thru to make a deposit (#responsible). But it wasn't as easy to transfer as she thought.

The athlete recently appeared on Kneading Dough, a video series produced by Uninterrupted, and told the story of how she tried to save her first big check only to have it backfire, Business Insider reports. "I never touched [the money] — just put it in the bank," she said on the show. "And I remember I went through the drive-thru to deposit my check, and then they were like, 'I think you need to come in for this,' and so I ended up going inside … 'Just put it in my account!'" She also joked, "I should've took a picture of it. I guess selfies didn't exist back then!"

And despite being the 51st-highest paid athlete in the world (and the only woman currently in the top 100), according to Forbes, Serena has never been in the tennis game for the money. "I've actually never played for money — I just thought you would go out there and hold a trophy," she said on Kneading Dough. "Not once did I think about a check...I just played for the love of the sport," she added. Spoken like a true athlete.

During the conversation, Serena also commented on the gender wage gap in the athletic world (a topic she recently dealt with when tennis player John McEnroe aimed a sexist comment at her). "You sacrifice so much, just as much as the guy next to me that's training every day, but he gets to be paid more. How do you explain that?" she said. "And so I could never really understand that. So Venus and I definitely did a lot of work ... but it's a work in progress. And we continue to fight the good fight."